HomeCircuitsLED Flasher Circuit with Relay

LED Flasher Circuit with Relay




Today in this article we are going to make a LED Flasher circuit with a Relay. This is a simple circuit based upon a Multi-Color LED and a General NPN Transistor. So, Let’s make this simple circuit. 

0 Profit selling KN95 masks and Infrared Thermometer from UTSOURCE.net: https://www.utsource.net/home/healthcare

Components Lists From Utsource:

Tools Needed:

Watch Video:

Here is the video from the Creative Creator YouTube channel. Watch the video and you will understand everything. 

Schematics of the LED Flasher Circuit with Relay:

Relay LED flasher circuit

How does the circuit work?

Here we are giving 3v to 5v to the circuit. The Multi-Color LED is connected with the base of the Transistor. The LED changes its color. So, for this reason, the Transistor triggers and the relay turns On/ Off while changing the color.  For this triggering, the Relay also triggers. 

As a result, the load which is connected with the Relay also triggered. For the Load, I have used 2 LEDs. One of the LED is connected with the NO Pin and the other pin is connected with the NC Pins. Here NO means Normally Opened and the NC means Normally Closed Terminals.  

Here you can also connect any load with it. It is a relay so it can handle much higher loads than Transistors. Like you can control 100W Lights easily. So, this is an Easy and Power efficient way of Flashing LED. 

Steps for making the Circuit:

Step 1: 

At first Pre-Tin the Legs of the Transistor with a soldering Iron. And also here are the pinouts of the BC547 Transistor. You can also read our other BC547 Projects

bc547 Pinout

Step 2:

Here I am using 6V relay. The relay can also be operated with 5V. Here are the pinouts of the 6V relay. There are 2 Coil Pins and 3 Contact Terminal Pins. One is common and the other 2 are NO & NC. The NO & NC stands for Normally Opened and Normally closed respectively.

6v Relay Pinout

Step 3:

No more Introduction. So, Let’s connect all the components together. First, Connect the Collector pin of the BC547 Transistor with the Relay coil Pin. 

collector connection with relay

Step 4:

Now take a Multicolor LED and then connect it with the circuit. More precisely connect the LED +ve with the other Relay terminal and connect the -ve of the LED with the Transistor’s Base.

Multi-color LED Connection

Step 5:

Now take One RED LED and one Green LED. Bend the two LED’s -ve with each other. Now connect the +ve’s of the LED with the NO & NC Pin Respectively as shown in the picture. Make sure that you rate connecting in right polarity otherwise the LEW will not run.

load connection with relay

Step 6:

Now connect a 220R resistor with the LED -ve and the Transistor’s Emitter Pin as shown in the picture. Here you have to give 3V to 5V supply. In my case, I have used a 3.7v 18650 LI-Ion Battery. Here you can see the LED is Flashing. 

resistor connection with transistor



The circuit is based upon Relay. The Relay is a mechanical device it works but there is a significant noise that comes from it. So, you should take care of these types of things. 

Flashing is done by the Multi-color LED. so if the LED is damaged then the circuit will not work. Please don’t use a voltage higher than 5V. otherwise, the Multicolor LED will be damaged and the Relay coil may be heating up quickly.

You can also read our other article about Arduino LED Chaser Circuit Here.












  1. I need to point out that over-all Im pretty taken with this web-site. Its very clear that you are aware of your subject matter and you are enthusiastic about it. I wish I possessed your ability to post. I have saved your blog and look ahead to additional posts.

  2. Howdy are using WordPress for your blog platform?
    I’m new to the blog world but I’m trying to get started and create my own. Do you require any
    coding knowledge to make your own blog? Any help would
    be really appreciated!

  3. Thank you for the auspicious writeup. It in fact was
    a amusement account it. Look advanced to more
    added agreeable from you! However, how could we communicate?

  4. hi!,I love your writing very so much! proportion we communicate more approximately your post on AOL? I require an expert in this house to solve my problem. May be that’s you! Having a look forward to look you.

  5. I抦 impressed, I need to say. Actually hardly ever do I encounter a weblog that抯 each educative and entertaining, and let me inform you, you could have hit the nail on the head. Your thought is outstanding; the problem is one thing that not enough persons are speaking intelligently about. I’m very joyful that I stumbled across this in my search for something regarding this.

  6. I’m still learning from you, as I’m improving myself. I certainly love reading all that is posted on your website.Keep the aarticles coming. I loved it!

  7. I’m extremely impressed with your writing skills as well as with the layout on your blog. Is this a paid theme or did you customize it yourself? Either way keep up the nice quality writing, it is rare to see a great blog like this one today..

  8. I just could not depart your site before suggesting that I actually enjoyed the standard info a person provide for your visitors? Is going to be back often in order to check up on new posts

  9. My spouse and i have been absolutely peaceful Albert managed to round up his inquiry through the entire ideas he made using your web pages. It’s not at all simplistic just to be giving away thoughts which usually many others could have been selling. We really discover we need you to thank for that. The entire explanations you have made, the simple blog menu, the friendships you will help create – it is many remarkable, and it’s letting our son and us know that this subject matter is cool, which is certainly tremendously pressing. Thank you for the whole lot!

  10. I will immediately grab your rss feed as I can’t find your e-mail subscription link or newsletter service. Do you’ve any? Please let me know so that I could subscribe. Thanks.

  11. Thank you sharing these types of wonderful posts. In addition, the optimal travel plus medical insurance strategy can often reduce those issues that come with journeying abroad. Your medical crisis can soon become expensive and that’s guaranteed to quickly slam a financial burden on the family’s finances. Setting up in place the ideal travel insurance program prior to setting off is well worth the time and effort. Thanks

  12. Write more, thats all I have to say. Literally, it seems as though you relied on the video to make your point. You clearly know what youre talking about, why waste your intelligence on just posting videos to your weblog when you could be giving us something enlightening to read?

  13. Thanks , I’ve recently been searching for information about this topic for ages and yours is the best I have discovered so far. However, what in regards to the conclusion? Are you positive in regards to the supply?

  14. Please let me know if you’re looking for a article author for your weblog. You have some really good posts and I believe I would be a good asset. If you ever want to take some of the load off, I’d absolutely love to write some material for your blog in exchange for a link back to mine. Please blast me an email if interested. Kudos!

  15. Does your site have a contact page? I’m having trouble locating it but, I’d like to shoot you an e-mail. I’ve got some suggestions for your blog you might be interested in hearing. Either way, great site and I look forward to seeing it improve over time.

  16. Appreciating the time and effort you put into your blog and detailed information you present. It’s awesome to come across a blog every once in a while that isn’t the same old rehashed material. Wonderful read! I’ve bookmarked your site and I’m including your RSS feeds to my Google account.

Comments are closed.

- Advertisment -